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Dendritic agates have dark-colored, fern-like patterns on the surface or the spaces between bands. [9] [10] They are composed of manganese or iron oxides. Moss agates exhibit a moss-like pattern and are usually green or brown in color. They form when dendritic structures on the surface of an agate are pushed inward with the silica gel during ...
Mug with mocha decoration, England, c. 1800, earthenware. Mocha decorated pottery (also known as the " Mocha Tea" technique) is a type of dipped ware (slip-decorated, lathe-turned, utilitarian earthenware), mocha or mochaware, in addition to colored slip bands on white and buff-colored bodies, is adorned with dendritic (tree-like or branching) markings resembling the natural geological ...
The first dendritic patterns were discovered in palaeontology and are often mistaken for fossils because of their appearance. The first theory for the creation of these patterns was published by Nash and Glicksman in 1974, they used a very mathematical method and derived a non-linear integro-differential equation for a classical needle growth.
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Moss agate pebble, 1 inch (25 mm) long Montana moss agate. Moss agate is a semi-precious gemstone formed from silicon dioxide.It is a form of chalcedony which includes minerals of a green color embedded in the stone, forming filaments and other patterns suggestive of moss. [1]
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